Well, lucky us, you're good at it.

then
the situation is lucky me
this is lucky her

is it possibe? 是什麼意思

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I am confused by "then the situation is lucky me this is lucky her is it possibe? mean?"
But Well, lucky us, you're good at it means, in this context, since "it" is b's job, that a is glad a (and other people who work with a) will benefit from b performing well at their job. 'Lucky us' is just another way of saying 'We are lucky that', 'lucky' means having good things happen to you through no work of your own, 'you're good at it' means that you are skilled or talented or successful or maybe efficient at doing that task.